oogle Chrome 66.0.3349.0 (Official Build) canary (64-bit) (cohort: 64-Bit) 
Google Chrome 64.0.3282.167 (Official Build) (64-bit) (cohort: Stable)

macOS Sierra 10.12.6
Full Keyboard access enabled on Mac to allow tab to move focus between all controls (otherwise focus won't go to this button with keyboard only, no screen reader. That makes this more of an edge case but still valid for keyboard only.)
Does not repro on Windows.

# Trigger the Save Password dialog 
# Navigate to the Never button, press enter
# Password is saved